What Game Boy accessory enabled Pokémon Red and Blue players to trade Pokémon?

The Game Link Cable enabled Pokémon Red and Blue players to trade Pokémon.

The cable connected two Game Boy systems and two compatible game cartridges. Players could use it to trade species that were exclusive to one version or to trigger trade-based evolutions. It also supported battles between players’ Pokémon teams.

This connection feature was central to Satoshi Tajiri’s original design. He imagined the link cable as a way to move collectible creatures between handheld consoles, expanding the cable’s role beyond the competitive uses seen in earlier games.

The Game Link Cable is sometimes confused with later Nintendo accessories. The Transfer Pak connected Game Boy Pokémon data to Nintendo 64 games, while the Wireless Adapter was introduced for later Game Boy Advance titles. The original Red and Blue experience depended on a physical cable.